I would say:
Wii: 17M because by all accounts it ought to have a good year.
Xbox 360: 15.5M because it ought to match the late 2010 performance with a price cut and it should be able to beat the early year performance with Kinect YOY.
PS3: 13M I don't think Sony will be able to increase the sales of the PS3 every year and I doubt that they will cut the price by more than $50 which ought to keep sales steady but not significantly boost them overall.
Tease.







